Tagged: terminal

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$? variable in linux

$? Status of the previous process / command which ran on the shell $ pwd $ echo $? // returns 0 which means the previous command ran sucessfully $ blahCommand $echo $? // returns...

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[: !=: unary operator expected

In bash, always use the double bracket conditional command [[ … ]] For example, #!/bin/bash sex=male if [[ $sex == ‘male’ ]];then echo “sex is male.” elif [[ $sex == ‘female’ ]];then echo “sex...